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W. E. SCHWAHZMANN.

HOUSING FOR MECHANICAL INTERRUPTERS.

APPLICATION FILED FEB. 71 1919.

Patented Mar. 30, 1920.

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- WQLEGADTG ERNEST SCHWARZMANN, 01E SPRINGFIELD, MASSACHUSETTS, ASSIGNGB T iMEBICAN BOSCH MAGNETO CQRPORACZION, OF NEW YGRK, T l. XI, 2. CORPORATYLQN D NEW YORK.

HQUSIETG FOR MECHANICAL INTERBUIPTERS.

sssnsoi Specification of Letters Patent.

llntentcd 3t Application filed February 7, 1919. Serial No. 275,633.

To all whom it may concern:

Be it known that I, WOLFGANG E. SCHWARZMANN, a citizen of the United States, residing at 51 Bellcleire avenue, Long il lieodow, Springfield, in the county of llumpden, State of Massachusetts, U. EL, have invented certain new and useful Improvements in Housings for Mechanical interrupters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the artto which it apperteins to make and use the some.

The present invention relates to housings for mechanical interrupters of magnetos or other ignition apparatus for internal combustion engines, and particularly to such, housings es carry the interrupter cams in cooperation with the rotatable interrupter contacts. In housings of this kind it was customary heretofore to have a different housing for each direction of the rotation of the interrupter, and also for fixed and variable ignition, therebyincreasing the cost of the manufacture and the amount of supply parts and materials required in practice.

.The primary object oi the invention is to provide it universal housing-Which may at will he used for both directions of rotation of the interrupter, and also for fixed or variable ignition in either direction ofrotation. Accordingly the housing comprises a member fixed to the ignition apparatus and carrying one locking element in any one of several positions and a cam ring carrying a second locking element cooperative with the first to provide therewith the fixed or veri able ignition in the direction of rotation desired. In the specific embodiment hereinafter described, an end plate of the ignition apparatus is provided with a plurality of seats adapted to accommodate a pin,-a1id the cum ring has a plurality of slots into which the pin may enter, so that, in certain relations of the locking elements, the cam ring is held against turning to provide fixed ignition, and in other relations the cam ring may bevturned within limits to provide vari: E1l)l0lgl1itlOD.- i I In addition to the foregoing, it is also desirable to provide for different positions of the timing urm'connected to the interrupter housing, because difierent engine builders require that the timing arm be on different sides of the housing, or ot'certuin points therebctween, in order that the connecting rod between the timing arm and the spark adjusting lever may be most con veniently arranged,

Another object of the ii vide, in association with the ing, an :u'rengeniem whereby erni may he brought to any POSl BiH on either side of the housing, to suit specific for fixed or variable ignition in either direction or rotation.

In the specific embodiinent hereinafter described, the outer surface of the cam ring is toothed and the inner surface of the timing ring also is toothed, so that the teeth thereof may he intermeshed when the timing arm is in substantially any enguler position on the can) ring.

In the accompanying drawings illustrating the preferred embodiment of the invention on application, as example, to a, bipolar mgneto, Figure 1 is an elevation of the rear end of the magneto with the cap removed; Figs. 2 is a front elevation of the timingring and arm; Fig. 3 is s section on line of F 2.; Fig, i is at side view of the cam l'lllg; FiQf. 5 is a. front view of the cam ring; Fig. (i is a front View of the end plate of the magneto; and Figs. 7 to 10 show the magneto with the parts set for fixed and variable ignition in both directions of rotation. J

The magneto l' has an end plate 2 provided with an annular flange 3 and the screw threaded holes 4, 5 and 6 adaptedto' has in its rezir peripheral edge a short slot I 9 and a long slot 10 into which the pin 7 may enter. The cum ring carries the cams 11 and 12 cooperating with the fiber block 13 of the defiectuble lever 1%. That lever, :urrying the interruptercontact 15 in cooporation with the interrupter contact -16, is rotatable with the interruiter plate 17 on the end of the armature s aft iIithe Well known way.

The outer periphery of the cam ring is toothed at 18, and the inner surface 19 of the timing ring 20 is toothed also, so that when the timing ring is contracted around the cam ring by the screw, 21, the teeth are inter-meshed. In this way the timing arm 22 may be fastened in any angular position on the cam ring to suit the requirements of the engine builder. When the timing ring is intermcshed with the cam ring, the adjusting pull on the spark lever is distributed around the periphery of the cam ring with the result that the cam ring does not bind in turning on the flange 3 of theend plate, no matter what angular position the timing arm may have.

The cooperativeinterrupter contacts 15, 16 should be separated. in the period of maximum generation of the magneto, and thus the fiber block 13 should engage the cam 11 or 1.2 to deflect the lever li in that period. To do this, the cam ring 8 must have a dili'erent angular position for each direction of rotation to compensate for the angular extent of the fiber block, whether the ignition is fixed or variable. Fig. 7 shows the arrangement of the parts for fixed ignition in a clockwise direction of rotation of the interrupter. The pin 7 is seated in the hole 5 and projectsinto the short slot 5), so that the cam ring is fixed in. that position. In Fig. 8 the pin 7 is seated in the hole 4t and projects in the short slot 9 for fixed ignition in anticlockwise direction. in Fig. 9 the pin 7 is seated n the hole and extends into the'long slot 10 for variable ignition in clockwise direction. in Fig. 10 the pin 7 is seated in the hole 6 and extends into the long slot 10 for variable ignition in anticlockwise direction. v

Thus by providing a plurality of seats for the pin 7 and a plurality of slots intb which the pin may enter, the cam ring may be fixed in position in the angular position required for fixed ignition in either direction of rotation, or for variable ignition in either direction of 'i-otzuion. Furthermore the'timing arm may have any angular relation with respect to the cam ring for fixed variable ignition in either direction of rotation. In this way all the requirements of the engine builder are met, and a single or universal housing provides for fixed or variable ignition in either direction of rotation.

lilaving thus described my invention what I claim is:

1. 111.1111 interrupter housing for ignition apparatus, a member fixed to the ignition apparatus and having a pluraiity of seats, a locking element adapted to be mounted on any one of said seats, and a cam ring carrying a locking element cooperative with the first when mounted on any one of said seats; substantially as and tor the purpose described.

2. In an interrupter housing for ignition apparatus, a member fixed to the ignition apparatus and having a plurality of seats, a pin adapted to be mounted on any one ot' said seats, and a cam ring having a slot for receiving the pin when mounted on said seats; substantially as and for the purpose described.

3. In an interrupter musing "tor ignition apparatus, a. member fixed to the ignition apparatus and having a plurality of seats, a pinadapted to be mminted on any one of said seats, and a cam ring having a plurality of slots into which the pin ma enter when mounted on said seats: substa iially as and for the purpose descrii;

4:. In an interrupter using tor ignition apparatus, a member fixed to the ignition apparatus and having a plurality of seats, a pin adapted to be mounted on any one of said seats, and a cam ring having short and long slots into which the pin may enter when mounted on said seats; substantially as and for the purpose described.

5. In an interrupter housing for ignition apparatus, a member fixed to the ignition apparatus and having a plurality of seats, a locking element adapted to be mounted on any one of said seats, a cam ring carrying a locking element coiipe 'ative with the first when mounted on any one of said seats and having wedge teeth on its periphery, and a timing ring having we lge teeth adapted to engage the wedge teeth on the cam ring.

(3. In an interrupter housing for ignition apparatus, a member fixed to the ignition apparatus and having a plurality oi seats, a locking element adapted to be mounted-on any one of said seats, a cam ring carryinga locking elementcooperative with the first when mounted on any one of said seats and having its outer surface toothed, a. timing ring having its inner surface toothed to engage the toothed surface of the cam ring, and means for contracting and expanding the timing ring around the cam ring.

in testimony whereof I alfix my signature.

WOLFGANG ERNEST SCHW ARZMAN N. 

